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如果x+y=2,x2-y2=6,则x-y=

如果x+y=2,x2-y2=6,则x-y=

2020-12-08
问题详情:如果x+y=2,x2-y2=6,则x-y=【回答】3;  知识点:因式分解题型:填空题...
 已知x2-y2=6,x-y=1,则x+y等于A.2                  B.3        ...

 已知x2-y2=6,x-y=1,则x+y等于A.2                  B.3        ...

2020-05-11
问题详情: 已知x2-y2=6,x-y=1,则x+y等于A.2                  B.3                C.4                     D.6【回答】D知识点:因式分解题型:选择题...